rustls_rustcrypto/
misc.rs

1#[macro_export]
2macro_rules! const_concat_slices {
3    ($ty:ty, $a:expr, $b:expr $(,)*) => {{
4        const A: &[$ty] = $a;
5        const B: &[$ty] = $b;
6        const __LEN: usize = A.len() + B.len();
7        const __CONCATENATED: &[$ty; __LEN] = &{
8            let mut out: [$ty; __LEN] = if __LEN == 0 {
9                unsafe { core::mem::transmute([0u8; core::mem::size_of::<$ty>() * __LEN]) }
10            } else if A.len() == 0 {
11                [B[0]; __LEN]
12            } else {
13                [A[0]; __LEN]
14            };
15            let mut i = 0;
16            while i < A.len() {
17                out[i] = A[i];
18                i += 1;
19            }
20            i = 0;
21            while i < B.len() {
22                out[i + A.len()] = B[i];
23                i += 1;
24            }
25            out
26        };
27
28        __CONCATENATED
29    }};
30    ($ty:ty, $a:expr, $b:expr, $($c:expr), + $(,)* ) => {{
31        const CON: &[$ty] = const_concat_slices!($ty, $a, $b);
32        const_concat_slices!($ty, CON, $($c), +)
33    }}
34}
35
36pub(crate) use const_concat_slices;
rustls_rustcrypto/misc.rs

rustls_rustcrypto/
misc.rs
